US5124533A - Pivotable clamping electrical heating device for a thermoplastic pipe welding jig - Google Patents

Pivotable clamping electrical heating device for a thermoplastic pipe welding jig Download PDF

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Publication number
US5124533A
US5124533A US07/602,336 US60233690A US5124533A US 5124533 A US5124533 A US 5124533A US 60233690 A US60233690 A US 60233690A US 5124533 A US5124533 A US 5124533A
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semi
radially outwardly
outwardly directed
heating device
accordance
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US07/602,336
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Armin Dommer
Dieter Dommer
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/20—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror"
    • B29C65/2007—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror" characterised by the type of welding mirror
    • B29C65/203—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror" characterised by the type of welding mirror being several single mirrors, e.g. not mounted on the same tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/20—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror"
    • B29C65/2007—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror" characterised by the type of welding mirror
    • B29C65/2023—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror" characterised by the type of welding mirror said welding mirror comprising several sectors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/20—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror"
    • B29C65/2053—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror" characterised by special ways of bringing the welding mirrors into position
    • B29C65/2084—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror" characterised by special ways of bringing the welding mirrors into position by pivoting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/114—Single butt joints
    • B29C66/1142—Single butt to butt joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81421—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave
    • B29C66/81423—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave being concave
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/22—Tubes or pipes, i.e. rigid

Definitions

  • This invention relates to a heating device for a welding jig having two guide arms with clamping devices for securing the plastic pipe sections or plastic moldings to be welded together.
  • the clamping devices are displaceable in relation to each other.
  • Two semi-circular electrical heating plates are connected or can be connected with each other at their free ends such that their interior receptacles face each other.
  • Such welding jigs are preferably used when welding plastic pipes in a trench. In this application, there is little space for the plastic pipe sections to be connected to each other. The welding process is further impeded where the plastic pipe sections are to be placed as protective pipes on an already existing inner pipe and must be welded together.
  • a heating device with two pivotably connected heating plates inserted vertically in relation to the plane defined by the two guide arms is known. When pivoted apart, the heating plates can be slipped on the inner pipe.
  • the two guide arms limit the opening angle of the heating device. Therefore, an inner pipe with a small diameter requires a welding jig with guide arms sufficiently far apart. However, such a welding jig requires a wide trench.
  • this object is attained due to the radius of the interior receptacles of the heating plates being the same as or greater than the radius of the outer dimension of an inner pipe on which the outer pipe to be welded is slipped and the radius of the outer circumference of the heating plates being greater than the radius of the outer circumference of the outer pipes.
  • the heating plates have radially outwardly directed extensions at their free ends which have recesses to receive the guide arms of the welding jig.
  • the connecting points of the heating plates are located in the areas of the extensions outside of these recesses for the guide arms.
  • the heating device When the heating plates are opened, the heating device can be slipped on parallel to the plane of connection of the guide arms without the guide arms limiting the opening range of the heating plates. Consequently, the inner pipe can have a diameter which may be considerably larger in relation to the distance between the guide arms than in the known welding jig and heating devices.
  • the heating device of this invention when applied, is additionally supported and centered by the guide arms, considerably reducing set-up time. Removal of the heating device is also easier.
  • the heating device can be constructed of two almost identical heating plates.
  • the distance between the centers of the centering of the plastic pipe sections or plastic moldings held in the clamping devices is also easier.
  • the distance between the centers of the recesses corresponds to the distance between the center longitudinal axes of the two guide arms and the recesses and the center of the closed heating plates is one half of the distance between the centers of the recesses.
  • the heating plates are connected as a non-detachable unit, hinged together at a first set of corresponding extensions, the hinge axis being oriented vertically to the heating surfaces of the heating plates.
  • the heating plates are adjustably connected to each other at the first set of corresponding extensions, the direction of adjustment extending vertically to the plane of separation of the heating plates.
  • the second set of corresponding extensions of the heating plates are connected to each other by means of a quick-release closure, for example, a toggle catch.
  • a compensating movement of the heating plates, necessary during heating, is made possible by the recesses of the first set of corresponding extensions being in the shape of semicircular or rectangular grooves which are one-half of the dimensions of the diameters of the guide arms, and by the recesses of the second set of corresponding extensions being open towards the end of the extensions and in their depth are one-half of the diameters of the guide arms.
  • the heating device is maintained on one of the guide arms but is displaceable in respect to the other guide arm.
  • FIG. 1 shows a lateral view of the heating device in the pivoted opened position of the heating plates.
  • FIG. 2 shows a lateral view of the heating device in the closed position and connected to the welding jig.
  • FIG. 1 illustrates how to pivot the two, practically identical heating plates 11 and 21 of the heating device 10 around the pivot shaft 20 and bring them into an opened position.
  • the heating plates 11 and 21 are semi-circular.
  • the interior receptacles 14 and 24 have a radius, starting at the center 19 or 29, which is as large or larger than one-half of the outer dimension of the inner pipe 40 on which the outer pipe 41, which pipes are to be connected to each other, are slipped.
  • the outer pipe 41 is fixed in a clamping device consisting of halves 43 and 44 which are held on the two guide arms 45 and 46, on which they are adjustable.
  • the orientation of the outer pipe 41 to the center longitudinal axis 42 is provided by the clamping device.
  • the radius of the exterior circumference 15 or 25 of the heating plates depends on the exterior dimensions of the outer pipe 41. However, it is greater than one-half of the exterior diameter of the outer pipe 41.
  • Heating plates 11 and 12 comprise electrical heating elements supplied with current through connectors 34 and 35.
  • the extensions 12 and 22 form seating lugs 18 and 28 for the pivot shaft 20, which pivotably connects both heating plates 11 and 21 to each other.
  • a displacement mechanism is used which permits parallel displacement of the heating plates 11 and 21 for placing them in an opened position.
  • the heating plates 11 and 12 are connected to each other such that their interior receptacles 14 and 24 are directed towards each other, forming an annular disk in the closed position.
  • the sides of the corresponding extensions 12, 22 and 16, 26 facing each other have first and second corresponding sets of recesses 13, 23 and 17, 27 which receive the guide arms 45 and 46. Accordingly, the distance between the first and second sets of recesses corresponds to the distance between the guide arms 45 and 46.
  • the recesses 13 and 23 form a receptacle for the guide arm 45. They are of equal size, adapted in their width to the diameter of the guide arm 45 and in their depth to the radius of the guide arm 45.
  • the distance between the center 30 or 32 of the recess 13 or 23 and of the center 31 or 33 of the recess 17 or 27 corresponds to the distance between the central longitudinal axes of the guide arms 45 and 46, while the distance from center 30 or 32 of recess 13 or 23 or from center 31 or 33 of recess 17 or 27 to the center 19 or 29 of the heating plate 11 or 21 is half the distance between the centers 30, 32 of recess 13, 23 and the centers 31, 33 of recess 17, 27 and corresponds to the distance between the central longitudinal axes of the guide arms 45 and 46 and the central longitudinal axis 42 of the welding jig.
  • the second set of corresponding recesses 17 and 27 of the corresponding extensions 16 and 26 are open facing away from central longitudinal axis 42 of the welding jig. It is also important that the pivot axis 20 or the displacement mechanism are positioned outside of the recesses 13 and 23 and also that, in the closed position of the heating device 10, the extensions 16 and 26 are connected to each other in a quickly releasable manner outside of the guide arm 46. Commercially available quick-release closures, such as toggle catches or the like, are suitable for this purpose.
  • the heating plates 11 and 21 may be provided with matched centering projections and receptacles. The disposition may be asymmetrical, so that identical heating plates 11 and 21 can be used.
  • the corresponding first set of recesses 13 and 23 may each have a semi-circular cross section corresponding to one-half of the cross section of the guide arm 45.
  • the guide arms 45 and 46 do not limit the opening angle of the heating plates as they do with the known heating devices which are slipped on the inner pipe 40 vertically to the plane of connection of the guide arms.
  • the arrow 36 indicates how the heating device 10, which is in the opened position, is slipped on, namely between the two front faces of the outer pipes 41 fixed in the two clamping devices.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)

Abstract

A heating device for a welding jig having two guide arms for welding together plastic pipe comprises two semi-circular electrical heating plates joined at one end by a pivotal or adjustable connection. Both ends of the heating plates have recesses for receiving the two guide arms when the heating device is in its closed position, enclosing the plastic pipes to be welded. The non-pivotally or non-adjustably connected ends of the heating plates are held together by a quick-release closure, such as a toggle catch, when the heating device is in its closed position.

Description

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a heating device for a welding jig having two guide arms with clamping devices for securing the plastic pipe sections or plastic moldings to be welded together. The clamping devices are displaceable in relation to each other. Two semi-circular electrical heating plates are connected or can be connected with each other at their free ends such that their interior receptacles face each other.
2. Description of Prior Art
Such welding jigs are preferably used when welding plastic pipes in a trench. In this application, there is little space for the plastic pipe sections to be connected to each other. The welding process is further impeded where the plastic pipe sections are to be placed as protective pipes on an already existing inner pipe and must be welded together.
A heating device with two pivotably connected heating plates inserted vertically in relation to the plane defined by the two guide arms is known. When pivoted apart, the heating plates can be slipped on the inner pipe. However, the two guide arms limit the opening angle of the heating device. Therefore, an inner pipe with a small diameter requires a welding jig with guide arms sufficiently far apart. However, such a welding jig requires a wide trench.
It is an object of the invention to provide a heating device of the previously mentioned type in which it is also possible to heat outer pipes placed on an inner pipe without using a welding jig in which the guide arms are far apart.
In accordance with this invention, this object is attained due to the radius of the interior receptacles of the heating plates being the same as or greater than the radius of the outer dimension of an inner pipe on which the outer pipe to be welded is slipped and the radius of the outer circumference of the heating plates being greater than the radius of the outer circumference of the outer pipes. In addition, the heating plates have radially outwardly directed extensions at their free ends which have recesses to receive the guide arms of the welding jig. The connecting points of the heating plates are located in the areas of the extensions outside of these recesses for the guide arms.
When the heating plates are opened, the heating device can be slipped on parallel to the plane of connection of the guide arms without the guide arms limiting the opening range of the heating plates. Consequently, the inner pipe can have a diameter which may be considerably larger in relation to the distance between the guide arms than in the known welding jig and heating devices. The heating device of this invention, when applied, is additionally supported and centered by the guide arms, considerably reducing set-up time. Removal of the heating device is also easier.
In embodiments of this invention where one half of each recess is distributed on each free end of the two heating plates, the heating device can be constructed of two almost identical heating plates. In these embodiments of the invention, the distance between the centers of the centering of the plastic pipe sections or plastic moldings held in the clamping devices is also easier. To obtain exact centering, the distance between the centers of the recesses corresponds to the distance between the center longitudinal axes of the two guide arms and the recesses and the center of the closed heating plates is one half of the distance between the centers of the recesses.
In one embodiment of this invention, the heating plates are connected as a non-detachable unit, hinged together at a first set of corresponding extensions, the hinge axis being oriented vertically to the heating surfaces of the heating plates. In another embodiment, the heating plates are adjustably connected to each other at the first set of corresponding extensions, the direction of adjustment extending vertically to the plane of separation of the heating plates.
Securing the heating plates in the closed position is achieved in a simple manner. The second set of corresponding extensions of the heating plates are connected to each other by means of a quick-release closure, for example, a toggle catch.
A compensating movement of the heating plates, necessary during heating, is made possible by the recesses of the first set of corresponding extensions being in the shape of semicircular or rectangular grooves which are one-half of the dimensions of the diameters of the guide arms, and by the recesses of the second set of corresponding extensions being open towards the end of the extensions and in their depth are one-half of the diameters of the guide arms.
The heating device is maintained on one of the guide arms but is displaceable in respect to the other guide arm.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described by means of an exemplary embodiment illustrated in the drawings.
FIG. 1 shows a lateral view of the heating device in the pivoted opened position of the heating plates.
FIG. 2 shows a lateral view of the heating device in the closed position and connected to the welding jig.
DESCRIPTION OF PREFERRED EMBODIMENTS
FIG. 1 illustrates how to pivot the two, practically identical heating plates 11 and 21 of the heating device 10 around the pivot shaft 20 and bring them into an opened position. The heating plates 11 and 21 are semi-circular. The interior receptacles 14 and 24 have a radius, starting at the center 19 or 29, which is as large or larger than one-half of the outer dimension of the inner pipe 40 on which the outer pipe 41, which pipes are to be connected to each other, are slipped. The outer pipe 41 is fixed in a clamping device consisting of halves 43 and 44 which are held on the two guide arms 45 and 46, on which they are adjustable. The orientation of the outer pipe 41 to the center longitudinal axis 42 is provided by the clamping device. The radius of the exterior circumference 15 or 25 of the heating plates depends on the exterior dimensions of the outer pipe 41. However, it is greater than one-half of the exterior diameter of the outer pipe 41.
The radially outwardly directed extensions 12 and 16 or 22 and 26 are formed on the free ends of the heating plates 11 and 21. Heating plates 11 and 12 comprise electrical heating elements supplied with current through connectors 34 and 35. The extensions 12 and 22 form seating lugs 18 and 28 for the pivot shaft 20, which pivotably connects both heating plates 11 and 21 to each other. In place of the pivotable seating, in another embodiment of the invention, a displacement mechanism is used which permits parallel displacement of the heating plates 11 and 21 for placing them in an opened position.
The heating plates 11 and 12 are connected to each other such that their interior receptacles 14 and 24 are directed towards each other, forming an annular disk in the closed position. The sides of the corresponding extensions 12, 22 and 16, 26 facing each other have first and second corresponding sets of recesses 13, 23 and 17, 27 which receive the guide arms 45 and 46. Accordingly, the distance between the first and second sets of recesses corresponds to the distance between the guide arms 45 and 46. The recesses 13 and 23 form a receptacle for the guide arm 45. They are of equal size, adapted in their width to the diameter of the guide arm 45 and in their depth to the radius of the guide arm 45. The distance between the center 30 or 32 of the recess 13 or 23 and of the center 31 or 33 of the recess 17 or 27 corresponds to the distance between the central longitudinal axes of the guide arms 45 and 46, while the distance from center 30 or 32 of recess 13 or 23 or from center 31 or 33 of recess 17 or 27 to the center 19 or 29 of the heating plate 11 or 21 is half the distance between the centers 30, 32 of recess 13, 23 and the centers 31, 33 of recess 17, 27 and corresponds to the distance between the central longitudinal axes of the guide arms 45 and 46 and the central longitudinal axis 42 of the welding jig. So that the heating device can be adjusted on the guide arms 45 and 46 during heating, the second set of corresponding recesses 17 and 27 of the corresponding extensions 16 and 26 are open facing away from central longitudinal axis 42 of the welding jig. It is also important that the pivot axis 20 or the displacement mechanism are positioned outside of the recesses 13 and 23 and also that, in the closed position of the heating device 10, the extensions 16 and 26 are connected to each other in a quickly releasable manner outside of the guide arm 46. Commercially available quick-release closures, such as toggle catches or the like, are suitable for this purpose. On the sides of the corresponding extensions 12, 16, 22 and 26 facing each other, the heating plates 11 and 21 may be provided with matched centering projections and receptacles. The disposition may be asymmetrical, so that identical heating plates 11 and 21 can be used.
The corresponding first set of recesses 13 and 23 may each have a semi-circular cross section corresponding to one-half of the cross section of the guide arm 45.
Because of the positioning of the guide arms 45 and 46 in the area of the plane of separation of the two heating plates 11 and 21, the guide arms 45 and 46 do not limit the opening angle of the heating plates as they do with the known heating devices which are slipped on the inner pipe 40 vertically to the plane of connection of the guide arms. The arrow 36 indicates how the heating device 10, which is in the opened position, is slipped on, namely between the two front faces of the outer pipes 41 fixed in the two clamping devices.

Claims (18)

We claim:
1. In a heating device for a welding jig having two guide arms with clamping devices for securing in place one of plastic pipe sections and plastic moldings to be welded together, said clamping devices being displaceable in relation to each other, and having two semi-circular electrical heating plates with facing interior receptacles and free ends which are connectable to each other, the improvement comprising:
a receptacle radius of the facing interior receptacles (14, 24) of the semi-circular electrical heating plates (11, 21) being one of equal to and greater than an inner pipe radius of an outer inner pipe circumference of an inner pipe (40) on which an outer pipe (41) to be welded is slipped,
a plate radius of an outer plate circumference (15, 25) of the semi-circular electrical heating plates (11, 21) being greater than an outer pipe radius of an outer pipe circumference of the outer pipe (41),
the semi-circular electrical heating plates (11, 21) having radially outwardly directed extensions (12, 16, 22, 26) on said free ends, said radially outwardly directed extensions having, on extension sides facing each other, recesses (13, 17, 23, 27) to receive the guide arms (45, 46) of the welding jig,
the semi-circular electrical heating plates (11, 21) having connecting points disposed in the radially outwardly directed extensions (12, 16, 22, 26) outside of said recesses (13, 17, 23, 27) for the guide arms (45, 46),
a recess distance between the centers of the recesses corresponding to a guide arm distance between the center longitudinal axes of the guide arms, and
a plate distance between the receptacle center of the receptacle formed by the semi-circular electrical heating plates and the centers of the recesses corresponding to one half said recess distance.
2. A heating device in accordance with claim 1,
wherein one half of each of the recesses (13, 17, 23, 27) is located on each of the two semi-circular electrical heating plates (11, 21).
3. A heating device in accordance with claim 2,
wherein the semi-circular electrical heating plates (11, 21) are pivotally connected at a corresponding first set of said radially outwardly directed extensions (12, 22), a pivotal axis of pivot (20) being oriented parallel to heating surfaces of the semi-circular electrical heating plates (11, 21).
4. A heating device in accordance with claim 2,
wherein the semi-circular electrical heating plates (11, 21) are adjustably connected to each other at a corresponding first set of said radially outwardly directed extensions (12, 22), a direction of adjustment being oriented perpendicular to a plane of separation of the semi-circular electrical heating plates (11, 21).
5. A heating device in accordance with claim 4,
wherein a corresponding second set of said radially outwardly directed extensions (16, 26) of the semi-circular electrical heating plates (11, 21) are securable to each other by a quick-release closure.
6. A heating device in accordance with claim 5,
wherein each of the recesses (13, 23) in said corresponding first set of said radially outwardly directed extensions (12, 22) are in a shape of one of semi-circular and rectangular grooves adapted to fit around one-half of each of the guide arms (45, 46).
7. A heating device in accordance with claim 6,
wherein each of the recesses (17, 27) in said corresponding second set of said radially outwardly directed extensions (16, 26) are open towards an end of the radially outwardly directed extensions (16, 26) and have a depth of a radius of the guide arms (45, 46).
8. A heating device in accordance with claim 1,
wherein the semi-circular electrical heating plates (11, 21) are pivotally connected at a corresponding first set of said radially outwardly directed extensions (12, 22), a pivotal axis of pivot (20) being oriented parallel to heating surfaces of the semi-circular electrical heating plates (11, 21).
9. A heating device in accordance with claim 1,
wherein the semi-circular electrical heating plates (11, 21) are adjustably connected to each other at a corresponding first set of said radially outwardly directed extensions (12, 22), a direction of adjustment being oriented perpendicular to a plane of separation of the semi-circular electrical heating plates (11, 21).
10. A heating device in accordance with claim 3,
wherein a corresponding second set of said radially outwardly directed extensions (16, 26) of the semi-circular electrical heating plates (11, 21) are securable to each other by a quick-release closure.
11. A heating device in accordance with claim 8,
wherein a corresponding second set of said radially outwardly directed extensions (16, 26) of the semi-circular electrical heating plates (11, 21) are securable to each other by a quick-release closure.
12. A heating device in accordance with claim 3,
wherein each of the recesses (13, 23) in said corresponding first set of said radially outwardly directed extensions (12, 22) are in a shape of one of semi-circular and rectangular grooves adapted to fit around one-half of each of the guide arms (45, 46).
13. A heating device in accordance with claim 8,
wherein each of the recesses (13, 23) in said corresponding first set of said radially outwardly directed extensions (12, 22) are in a shape of one of semi-circular and rectangular grooves adapted to fit around one-half of each of the guide arms (45, 46).
14. A heating device in accordance with claim 3,
wherein each of the recesses (17, 27) in said corresponding second set of said radially outwardly directed extensions (16, 26) are open towards an end of the radially outwardly directed extensions and have a depth of a radius of the guide arms (45, 46).
15. A heating device in accordance with claim 8,
wherein each of the recesses (17, 27) in said corresponding second set of extensions (16, 26) are open towards an end of the radially outwardly directed extensions (16, 26) and have a depth of a radius of the guide arms (45, 46).
16. A heating device in accordance with claim 9,
wherein a corresponding second set of said radially outwardly directed extensions (16, 26) of the electrical heating plate (11, 21) are securable to each other by a quick-release closure.
17. A heating device in accordance with claim 9,
wherein each of the recesses (13, 23) in said corresponding first set of said radially outwardly directed extensions (12, 22) are in a shape of one of semi-circular and rectangular grooves adapted to fit around one-half of each of the guide arms (45, 46).
18. A heating device in accordance with claim 9,
wherein each of the recesses (17, 27) in a corresponding second set of said radially outwardly directed extensions (16, 26) are open towards an end of the radially outwardly directed extensions (16, 26) and have a depth of a radius of the guide arms (45, 46).
US07/602,336 1989-04-10 1990-03-22 Pivotable clamping electrical heating device for a thermoplastic pipe welding jig Expired - Fee Related US5124533A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19893911633 DE3911633A1 (en) 1989-04-10 1989-04-10 HEATING DEVICE FOR A WELDING DEVICE
DE3911633 1989-04-10

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EP (1) EP0420951B1 (en)
JP (1) JPH03505435A (en)
AT (1) ATE94459T1 (en)
DE (2) DE3911633A1 (en)
DK (1) DK0420951T3 (en)
FI (1) FI906055A0 (en)
WO (1) WO1990011885A1 (en)

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US5252154A (en) * 1991-08-09 1993-10-12 Tremco, Inc. Gasket system
US5622592A (en) * 1993-03-04 1997-04-22 Georg Fischer Rohrleitungssysteme Ag Apparatus for welding shaped workpieces formed from a plastic material
US5692285A (en) * 1995-10-31 1997-12-02 Workman Developments, Inc. Butt fusion apparatus with means for changing quickly between straight pipe and pipe fitting attachment positions, and method
US5830312A (en) * 1995-10-31 1998-11-03 Hughes Supply, Inc. Butt fusion apparatus with clamping jaws for clamping pipe to be fused without interference between the clamps and the pipe
US5868170A (en) * 1993-04-09 1999-02-09 Simona Ag Axial interlock system for fluid containment system having inner and outer conduits
US6228204B1 (en) * 1998-02-05 2001-05-08 Crane Co. Method and apparatus for welding together fluoropolymer pipe liners
US6358348B1 (en) * 1998-01-20 2002-03-19 Single Buoy Moorings Inc. Method of welding generally rod-shaped structures of a fluorine-containing plastic material in a butt weld
US6629551B1 (en) 1999-04-18 2003-10-07 Entegris, Inc. Beadless welding apparatus comprising a weld head having a bias member for axial displacement
US20070257026A1 (en) * 2006-04-26 2007-11-08 Nissan Diesel Motor Co., Ltd. Heating component for pipe joint
US20070295223A1 (en) * 2006-06-22 2007-12-27 Kenyon International, Inc. Grill
US20100254687A1 (en) * 2009-10-29 2010-10-07 Pipeline Induction Heat Limited apparatus and method for heating a pipe
US20110001283A1 (en) * 2008-11-26 2011-01-06 Seber Design Group, Inc. Quick release bench vise system
US20120168415A1 (en) * 2009-09-27 2012-07-05 Kwai Yin Tsang Butt-welding and electrofusion joining machine
US20120255163A1 (en) * 2009-11-03 2012-10-11 Joachim Stein System for Connecting Hose Lines
US20150147054A1 (en) * 2013-11-25 2015-05-28 Ironman Valve Heaters, Llc Heater and Heating System
US9145993B1 (en) * 2012-10-22 2015-09-29 The Boeing Company Non-metallic fluid coupling assemblies
US9409249B1 (en) 2012-01-19 2016-08-09 Christopher Bryan Trussell Welding assistance systems
US20190249803A1 (en) * 2018-02-12 2019-08-15 David Franklin Apparatus for securing a pair of pipes
CN112848333A (en) * 2021-01-07 2021-05-28 刘仕贵 PPR hot melt ware for architectural decoration

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EP0855955A1 (en) * 1995-10-16 1998-08-05 Bernhard Ulrich Process and device for heat mirror-welding plastic pipe sections

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Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5252154A (en) * 1991-08-09 1993-10-12 Tremco, Inc. Gasket system
US5622592A (en) * 1993-03-04 1997-04-22 Georg Fischer Rohrleitungssysteme Ag Apparatus for welding shaped workpieces formed from a plastic material
US5868170A (en) * 1993-04-09 1999-02-09 Simona Ag Axial interlock system for fluid containment system having inner and outer conduits
US5692285A (en) * 1995-10-31 1997-12-02 Workman Developments, Inc. Butt fusion apparatus with means for changing quickly between straight pipe and pipe fitting attachment positions, and method
US5830312A (en) * 1995-10-31 1998-11-03 Hughes Supply, Inc. Butt fusion apparatus with clamping jaws for clamping pipe to be fused without interference between the clamps and the pipe
US6358348B1 (en) * 1998-01-20 2002-03-19 Single Buoy Moorings Inc. Method of welding generally rod-shaped structures of a fluorine-containing plastic material in a butt weld
US6228204B1 (en) * 1998-02-05 2001-05-08 Crane Co. Method and apparatus for welding together fluoropolymer pipe liners
US6629551B1 (en) 1999-04-18 2003-10-07 Entegris, Inc. Beadless welding apparatus comprising a weld head having a bias member for axial displacement
US20070257026A1 (en) * 2006-04-26 2007-11-08 Nissan Diesel Motor Co., Ltd. Heating component for pipe joint
US8631739B2 (en) 2006-06-22 2014-01-21 Kenyon International, Inc. Grill
US20070295223A1 (en) * 2006-06-22 2007-12-27 Kenyon International, Inc. Grill
US20110001283A1 (en) * 2008-11-26 2011-01-06 Seber Design Group, Inc. Quick release bench vise system
US8517366B2 (en) * 2008-11-26 2013-08-27 Seber Design Group, Inc. Quick release bench vise system
US20120168415A1 (en) * 2009-09-27 2012-07-05 Kwai Yin Tsang Butt-welding and electrofusion joining machine
US20100254687A1 (en) * 2009-10-29 2010-10-07 Pipeline Induction Heat Limited apparatus and method for heating a pipe
US9080701B2 (en) * 2009-10-29 2015-07-14 Pipeline Induction Heat Limited Apparatus and method for heating a pipe
US8870229B2 (en) * 2009-11-03 2014-10-28 Contitech Techno-Chemie Gmbh System for connecting hose lines
US20120255163A1 (en) * 2009-11-03 2012-10-11 Joachim Stein System for Connecting Hose Lines
US9409249B1 (en) 2012-01-19 2016-08-09 Christopher Bryan Trussell Welding assistance systems
US9145993B1 (en) * 2012-10-22 2015-09-29 The Boeing Company Non-metallic fluid coupling assemblies
US20150147054A1 (en) * 2013-11-25 2015-05-28 Ironman Valve Heaters, Llc Heater and Heating System
US20190249803A1 (en) * 2018-02-12 2019-08-15 David Franklin Apparatus for securing a pair of pipes
CN112848333A (en) * 2021-01-07 2021-05-28 刘仕贵 PPR hot melt ware for architectural decoration

Also Published As

Publication number Publication date
DE3911633C2 (en) 1991-01-10
DK0420951T3 (en) 1994-01-10
DE3911633A1 (en) 1990-10-11
FI906055A0 (en) 1990-12-07
ATE94459T1 (en) 1993-10-15
EP0420951A1 (en) 1991-04-10
EP0420951B1 (en) 1993-09-15
DE59002724D1 (en) 1993-10-21
WO1990011885A1 (en) 1990-10-18
JPH03505435A (en) 1991-11-28

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